How can I smooth or add loop cut without putting it between faces one by one?
To add multiple loop cuts at the same time, use Ctrl+R to enable the loop cut tool, then scroll up/down to increase/decrease the number of cuts.

Edit:

Use Subdivide rather than loop cut. Select all the faces, press Ctrl+F, then select subdivide. You'll end up with an extra loop parallel to the circle, so select that loop, and Dissolve Edges.